Synthesis of Imidazo[1,5-a]quinolines via Metal-Free Oxidative Amination of sp3 C–H Bonds
作者:Chen Ma、Huanhuan Liu、Xinfeng Wang
DOI:10.1055/s-0037-1610137
日期:2018.7
Abstract A novel oxidativeamination of sp3 C–H bonds was developed for the efficient synthesis of imidazo[1,5-a]quinolines from readily available α-amino acids and (2-azaaryl)methanes. This domino protocol, which was established in a TBAI-TBHP oxidation system, includes transition-metal-free decarboxylation and intramolecular cyclization. This method represented a new avenue for the synthesis of N-heterocycles
摘要 开发了一种新型的sp 3 C–H键氧化胺化反应,用于从容易获得的α-氨基酸和(2-氮杂芳基)甲烷高效合成咪唑并[1,5- a ]喹啉。建立在TBAI-TBHP氧化系统中的多米诺协议包括无过渡金属的脱羧和分子内环化。该方法代表了使用2-甲基喹啉作为喹啉-2-甲醛的合成子合成N-杂环的新途径。 开发了一种新型的sp 3 C–H键氧化胺化反应,用于从容易获得的α-氨基酸和(2-氮杂芳基)甲烷高效合成咪唑并[1,5- a ]喹啉。建立在TBAI-TBHP氧化系统中的多米诺协议包括无过渡金属的脱羧和分子内环化。该方法代表了使用2-甲基喹啉作为喹啉-2-甲醛的合成子合成N-杂环的新途径。
Electrocatalytic Intermolecular C(sp<sup>3</sup>)–H/N–H Coupling of Methyl <i>N</i>-Heteroaromatics with Amines and Amino Acids: Access to Imidazo-Fused <i>N</i>-Heterocycles
作者:Peng Qian、Zicong Yan、Zhenghong Zhou、Kangfei Hu、Jiawei Wang、Zhibin Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.8b02578
日期:2018.10.19
An efficient NH4I-mediated intermolecular annulation of methyl N-heteroaromatics with amines/amino acids was developed by virtue of anodic oxidation, providing a variety of functionalized imidazo-fused N-heterocycles with good to excellent yields. The practicality of this protocol was demonstrated by the readily available starting materials, broad substrate scope, water tolerance, scalability, and
selenocyanation of imidazo[1,5-a]quinolines with KSeCN under metal catalyst- and chemical oxidant-free conditions. This sustainable strategy shows a broad scope and great compatibility with functional groups, and affords synthetically and biologically important selenocyanated imidazo[1,5-a]quinolines in good to excellent yields with cheap graphite and Ni plates as the electrodes. The gram-scale synthesis was also
Natural α-Amino Acids Applied in the Synthesis of Imidazo[1,5-<i>a</i>]N-heterocycles under Mild Conditions
作者:Qiang Wang、Shuai Zhang、Fengfeng Guo、Baiqun Zhang、Ping Hu、Zhiyong Wang
DOI:10.1021/jo302299u
日期:2012.12.21
A facile iodine-mediated decarboxylative cyclization from alpha-amino acids and N-heterocyclic carbaldehydes was developed. By virtue of this method, a series of imidazo[1,5-a]N-heterocycles can be synthesized efficiently under mild conditions. A tentative reaction mechanism was proposed based on the experimental results and previous reports.
Electrochemical selective divergent C–H chalcogenocyanation of <i>N</i>-heterocyclic scaffolds